單項選擇題The diameter of the crank-pins should be measured with a （）.
A.salinometer
B.thermometer
C.tachometer
D.micrometer
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1.單項選擇題The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.
A.water
B.fresh air
C.oils
D.gases
2.單項選擇題The design of the connecting rod large end bearing is similar to that of the mainbearings Whats the meaning of "that" in the sentence above?（）
A.the connecting rod
B.large end bearing
C.the main bearing
D.the design
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